Re: Mean Field Theory and Heisenberg Model



Posted by Steve Simon on June 6, 2015, 5:08 pm, in reply to "Mean Field Theory and Heisenberg Model"

In mean field theory Ising spin 1/2 and Heisenberg spin 1/2 actually behave the same way. Starting with Si dot Sj = Szi Szj + Sxi Sxj + Syi Syj Let us say we are looking at site i, then Sj becomes . In mean field, this average spin points in only one direction (which we can choose to be z) in which case Si dot = Szi < Szj>

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Message Thread Mean Field Theory and Heisenberg Model - Saad June 5, 2015, 9:30 pm Re: Mean Field Theory and Heisenberg Model - Steve Simon June 6, 2015, 5:08 pm Re: Mean Field Theory and Heisenberg Model - Saad June 6, 2015, 5:33 pm Re: Mean Field Theory and Heisenberg Model - Steve Simon June 6, 2015, 6:45 pm Re: Mean Field Theory and Heisenberg Model - Saad June 6, 2015, 8:01 pm « Back to index

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